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z in (-oo:+oo)
(1/2)*(10*z+8)-2 = 4*(z-8) // - 4*(z-8)
(1/2)*(10*z+8)-(4*(z-8))-2 = 0
(1/2)*(10*z+8)-4*(z-8)-2 = 0
1/2*(10*z+8)-4*(z-8)-2 = 0
1/2*(10*z+8)-4*(z-8)-2 = 0
z-2+36 = 0
z+34 = 0
z+34 = 0
z+34 = 0 // - 34
z = -34
z = -34
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